tomcat not starting after certificate installation

[Noura Shaaban]

Hi
we have tomcat 5.5 on solaris 5.10
since Verisign certificate has expired,we ordered a new certificate
and added the new one in cacerts 
when restarting tomcat,it gives the response "started successfully"
but in browser(all browsers),we have "Page can not be displayed"
what could be the problem?I don't know which log file to check,there are so 
many...
Could it be that the new c ertificate is 128-bit encryption?
thanks